If he ______ it, he _______ it.
A．had seen; could have believedB．saw; couldn’t believe
C．saw; couldn’t have believedD．has seen; had believed
A
考察虛擬語氣.句意:如果他看見了它,他可能已經(jīng)相信了. 表示與過去事實相反的假設(shè)，if 從句的謂語形式用過去完成時即had＋過去分詞; “could+have+done”是虛擬語氣，表示對過去事情的假設(shè)，意思是本來能夠做某事而沒有做。故選A.
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